PPSC Chemistry Full Book Test With Answers

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PPSC Chemistry Full Book Test

Sr. # Questions Answers Choice
1 The process of passing of a precipitate into colloidal solution, on adding an electrolyte is called. Dialysis Peptization Electrophoresis Electromsmosis
2 Wlhich of the following can act as a protective colloid Gelatin Silica gel Oil in water emulsion All three
3 The tyndall effect was used by Zsigmondy to device. The ultramicroscope The ultracentrifuge The osmometer Electrodialysis
4 A colloidal system in which a liquid is dispersed in a solid is called a/an Emulsion Sol Gel Precipitate
5 An emulsifier is an agents which Stabilizes an emulsion Homgeneises and emulsion Causes coagulation of an emulsion Helps in the formation of an emulsion
6 A silver iodide and was prepared by mixing KI and AgNO2 solution with the AgNO2 in slight excess. Which of the following descriptions is correct regarding is not particles. Negatively charged because of the excess of NO-3 ions Positively charged because of the excess of Ag+ ions in the AgI lattice Negatively charged because I ions are adsorbed from the KI solution Neutral
7 Which of the following will be most effective int he coagulntion of
Fe (OH)3 sol.
 NaCl MgSO4 AlCl3 Mg3 (PO4)2
8 The stabilization of the dispersed phase in a lyophobic sol is due to Liking for the dispersion medium The surface tension of the medium The formation of an electrical layer between the two phases The viscosity of the medium
9 Which of the following electrolytes will be most effective in the coagulation of arsenic sulphide sol. NaNO3 AI PO4 MgSO4 K4[Fe(CN)6]
10 When a strong beam of light is passed through a colloidal solution, the light will Be reflected Be scattered Pass unchanged Be dispersed
11 In the process of electrosmosis Colloidial particles move towards the electrodes Both colloidal particles and dis persons medium move Only dispersion medium moves to carry the current Positively charged colloidal particles move, but negatively charged particles remain stationary
12 Smoke is a dispersion of Gas in gas Gas in solid Solid in gas Liquid in gas
13 The migration of positively charged colloidal particles, under an electrical field , towards the cathode is called. Cataphoresis Electroamosis Sedimentation Electrodialysis
14 The process of removing disolved impurities from a colloidal system, by means of diffusion through a suitable membrane under the influence of an electric field , is called. Electrosmosis Electrodialysis Electrophoresis Peptization
15 Which of the following colligative properties can be used to characterize colloidal particles. Lowering in vapour pressure Elevation in boiling point Depression in freezing point Osmotic pressure
16 Colloids can be purified by Peptization Coagulation The Breeding are method Dialysis
17 Which of the following is the cause of Brownian movement of colloidal particles. Convection currents int he fluid Bombardment by the molecules of the dispersion medium Setting of dispersed phase under gravity. Thermal gradient in the medium
18 Which of the following statement is false regarding lyphilic sols. The colloidal particles show a linking for the dispersion medium These are generally easy to prepare These are more stable than lyophobic sols The stability of the sols is mainly due to the electrical double layer
19 A system is said to be in the colloidal state if the particle size of the dispersed phase ranges from <div> <sub>o</sub></div>I to 10 A 10 to 10000 A 10 to 100 A 1000 to 10000 A
20 In a standard Weaton cell the cathode is Cadmium amalgam Mercury Platinum Carbon
21 Concentration polarization arises because of the Different concentrations of solutions in the two half cells Changes in the concentration of electrolyte around the electrode from bulk concentration Reversible nature of the cell Variation in temperature during measurements
22 A half cell reaction is one that Occurs at one electrode Goes only half way to completion Involves a half mole of the concentration of the solution Always oxidizes
23 The depolarizer used in dry cell batteries in. NH4Cl MnO2 KOH Na2PO4
24 The electrode Pt/Fe2+ (C1) Fe 3+ (C2) belong to the type. Gas electrodes Inert metal electrodes Magam electrodes Metal metal insoluble salt electrode
25 Which of the following statement is not correct regarding galvanic cells. Oxidation occurs at the anode Ions carry current inside the cell Electrons flow around the external circuit. form cathode to anode When the e.m.f. of the cell is positive cell reactionis spontaneous
26 In which of the following compound valency of carbon in 4 but its oxidation number is zero Methane Carbon dioxide Carbon monoxide Formaldeyde
27 The oxidation Number of I in HIO4 is. +6 + 7 + 3 + 14
28 During reaction of copper with aqueous solution of silver nitrate Silver atoms are reduced Cu2+ ions are reduced Silver ions are reduced No<sup>3</sup> ions are reduced
29 Which of the following process always involve the decrease in oxidation number. Hydrolysis Elecomposition Oxidation Reduction
30 The equivalent conductance (^) and molar conductance ( ^ m ) of BaSO4 are related as. ^ = ^m/2 ^/2 = ^m ^ = ^m ^ = ^m/4
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